Drilling-machine



(No Model.)

V. P. PRENTIGE. DRILLING MACHINE.

No. 418,383. Patented Dec. 31, 1889.

Urns. Phnmunmqmphef, wuhingmn. n. c.

UNITED STATES PATENT OFFICE.

VERNON F. PRENTIOE, OF VOROESTER, MASSACHUSETTS.

DRlLLlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 418,383, dated December 31, 1889.

Application tiled November 4, 1889. Serial No. 329,134. (No model.) i

To all whom) it may concern:

Be it known that I, VERNON F. PRENTICE,

'a citizen of the United States, and a resident `of Vorcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement inDrilling-Machines, of which the following is a specification, reference being had to the accompanying drawings, representing such portions of a drillingmachine as embody my invention, and in which- Figure l represents the upper portion or head of a drilling-machine embracing the mechanism by which the back gears are broughtinto engagement; and Fig. 2 is an enlarged view of the shipping device by which the back gears are brought into engagement, the twoshafts O and D being shown in sectional view on line X X, Fig. l.

Similar letters refer to similar parts in both views.

Referring to the drawings,A denotes the upper part of the frame-work of a drillingmachine supporting the upper end of the drillspindle B and the upper driving-shaft O, from which rotary motion is imparted to the drillspindle B by means of the beveled gears B B2. The upper horizontal shaft is driven through a belt-connection with a countershaft (not shown) by the cone-pulley O', running loosely upon the shaft O. To theconepulley O is attached a pinion O2, provided with clutch-teeth a upon its side, and sliding upon the shaft O, with a spline-connection therewith, is the opposing half-clutch a,pro vided with teeth b, and having an annular groove, forming a neck b', to receive the prongs of a shipping-fork. Below the shaft O, and parallel therewith, is journaled the short shaft D, having an attached pinion D', engaging the gear C3, attached to the shaft O, as represented in the drawings, Fig. l. Upon the opposite end of the short shaft Dis attached a gear D2, engaging the pinion C2 upon the cone-pulley O', and when the gears O2, D2, D', and O3 are in engagment, as shown, the motion of the cone-pulley will be communicated through the gears mentioned to the shaft O, and through the gears B B2 to the drill-spindle B.

Upon the short shaft D is a collar D3, provided With an annular groove, forming a neck to receive the prongs of the shipper-fork c. J ournaled in the lugs E E', attached to the rigid portion of the frame-work, is a rocking shaft c, carrying upon one end the operatinglever E, and carrying between the lugs E E the shipping-forks CZ and e, the former eX- tending upwardly to engage the sliding halfcluteh a', and the latter extending downwardly to engage the collar D3 upon the shaft D. lVhen it is desired to disconnect the back gears and connect the cone-pulley O directly with the shaft O, the lever E is moved to the left, Fig. l, thereby sliding the short shaft D in its bearings and carrying the gears D and D2 to the left and out of engagement with the gears O2 and O3,.and at the same time sliding the half-clutch e along the shaft O and into engagement With the clutch-teeth a upon the conepulley C. The cone-pulley is thus connected with the shaft O through the clutch-teeth a and b, or through the back gears carried upon the shaft D, as may be desired.

I do not claim,broadly, the employment of back gears carried upon a shaft parallel with the driving-shaft and having a sliding motion in a line parallel with the axis of the shaft, as such has been in use 5 but Vhat I do claim as of my invention, and desire to secure by Letters Patent, is-

In a drilling-machine, the combination,with the driving-shaft O, having an attached gear O3, and a cone-pulley C', running loosely upon said shaft and having an attached pinion O2, of the clutches a and b, the sliding shaft D, carrying the gears D and D2, andan oscillating shipper comprising the shaft c, forks l and e, engaging the clutches, an d sliding shaft and operating-lever E, substantially as dcscribed.

Dated at Worcester, in the county of 70rcester and State of Massachusetts, this 2d day of November7 1889.

VERNON F. PRENTIOE.

Witnesses:

RUFUs B. FOWLER, H. W. FOWLER. 

